My website has been supported by Photoshelter since 2008. I've found them to be a very reliable platform both for backing up my images and for image sales. Their website customization options are brilliant as well. The best thing about them, however is their customer support.
A few days ago they emailed to say that they would be featuring me on their photographer profiles page. Yay! for the extra visibility :)
So honored to be sharing space with the featured talent.